Armchair



FIG. 1 is a front perspective view of an armchair showing my design;

FIG. 2 is a side perspective view;

FIG. 3 is a plan view of the armchair;

FIG. 4 is a rear perspective view; and

FIG. 5 is a bottom plan view of the armchair. 

The ornamental design of an armchair, substantially as shown. 